Comparison of pulmonary deposition of nebulized 99m technetium‐diethylenetriamine‐pentaacetic acid through 3 inhalation devices in healthy dogs
| Autor: | Doris Kampner, Maximilian Pagitz, Alexander Tichy, Andreas Hiebl, Alejandra Carranza Valencia, Peter Rüthemann, Reinhard Hirt |
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| Rok vydání: | 2021 |
| Předmět: |
inhalation
lcsh:Veterinary medicine Lung CATS General Veterinary Inhalation medicine.diagnostic_test business.industry Respiratory disease radiopharmaceutical medicine.disease Scintigraphy Beagle Crossover study lung medicine.anatomical_structure Anesthesia dog lcsh:SF600-1100 scintigraphy Medicine business Nose |
| Zdroj: | Journal of Veterinary Internal Medicine, 35 (2) Journal of Veterinary Internal Medicine, Vol 35, Iss 2, Pp 1080-1087 (2021) |
| ISSN: | 1939-1676 0891-6640 |
| Popis: | Background Inhalation treatment frequently is used in dogs and cats with chronic respiratory disease. Little is known however about the performance of delivery devices and the distribution of aerosolized drugs in the lower airways. Objective To assess the performance of 3 delivery devices and the impact of variable durations of inhalation on the pulmonary and extrapulmonary deposition of nebulized 99mtechnetium‐diethylenetriamine‐pentaacetic acid (99mTc‐DTPA). Animals Ten university‐owned healthy Beagle dogs. Methods Prospective crossover study. Dogs inhaled the radiopharmaceutical for 5 minutes either through the Aerodawg spacer with a custom‐made nose‐muzzle mask, the Aerochamber spacer with the same mask, or the Aerodawg spacer with its original nose mask. In addition, dogs inhaled for 1 and 3 minutes through the second device. Images were obtained by 2‐dimensional planar scintigraphy. Radiopharmaceutical uptake was calculated as an absolute value and as a fraction of the registered dose in the whole body. Results Mean (±SD) lung deposition for the 3 devices was 9.2% (±5.0), 11.4% (±4.9), and 9.3% (±4.6), respectively. Differences were not statistically significant. Uptake in pulmonary and extrapulmonary tissues was significantly lower after 1‐minute nebulization, but the mean pulmonary/extrapulmonary deposition ratio (0.38 ± 0.27) was significantly higher than after 5‐minute nebulization (0.16 ± 0.1; P = .03). No significant differences were detected after 3‐ and 5‐minute nebulization. Conclusion and Clinical Importance The performance of a pediatric spacer with a custom‐made mask is comparable to that of a veterinary device. One‐minute nebulization provides lower pulmonary uptake but achieves a better pulmonary/extrapulmonary deposition ratio than does 5‐minute nebulization. Journal of Veterinary Internal Medicine, 35 (2) |
| Databáze: | OpenAIRE |
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